US1124514A - Hydraulic stuffing-box. - Google Patents

Description

' T. M. lLATT. HYDRAULIC STUYFING BGX. APPLIGA'MO! IILBD APB.23,1914.

Patented Jan. 12, 1915.

W/TNESSES STATE-s sagem* OFFICE,

.momes M. rLs'r'r, er rintsmsnrzs, zemmsmvsma, AssIsNon 'ro en. WHEELER .MANUFACTURING COMPANY, 0F PHILADELPHIA, PENNSYLVANIA, COBPOB/ATIO'N f FENNSYLVANIA.

HYnBsULI'o srUrrrNG-Box. I

Application lllcd April 23, 1914. Serial No. 833,883.

To allwhom i'tmay concern:

,Be it known that I, THOMAS M. PLAT?,

a citizen of the United States, residing' 1n the city of Philadelphia, county of Phila-l delphia, and State of Pennsylvania, have invented ce'rtain new and useful .Improvements in Hydraulic Stuffingdoxes, of which the following isa specification. l

lMy invention relates to 'a hydraulic stufl ing box or a stufling box for kprevention ofV leakage of gas or liquid `along a rotary shaft or reciprocating rod extending through the Wall of a chamber on opposite sides of which are masseso. fluid underdiflferent pressures.

'More particularly my invention Aresides in a stuffing box of the character above referred i* to bv-Which leakage of air along the rotary shaft of a. rotary or centrifugal plump to the interior of a pump is prevented My invention resides a s tnling'vboxl of the character referred to in which liquid Y or Water seal .is provided, the sealinggmean's comprising a chamber Ior cavity subjected to liquid or water pressure, and a vgroove of any suitable shape and pitch is madejm a member within which. the shaft orsheft.

sleeve rotates.

My invention resides in a stuffing box of the character hereinafter described and claimcd..

For an illustration'of, one of vthe lforms.

my invention may take reference mav be had `to the accompanying drawing, in which:

Figure 1 is n Avertical'sectional view through the stuflinglbinfnd through the part of a chamber or casing through whose Wall a rotary shaft, .shown inA elevation, ex-

tends.` Fig. 2 `isf.n"`isivde elevation of ,the stuling box. F. igL-SE is-,nfend elevational view of the snmejiff j Y' l In Fig. 1 a casing l1-of. `ceritrifugal pump, rotaryY entrninrnent pimp', lor similar ap paratus, is shown in section, it being understood however that' myiinvention is not limited to use in 'connection ywith such apparatus. `vln theipump head 2, secured to the casing 1, is a stuiingbox bushing 3 die` `V`posedetithe inner end of. thebored:v in the head 2'. The rotary." shaft 5`is here shown l'asprqnfidedlWithin Wearing'sleeve 6, though .it is to beunderstood thatl 'my'nr'ention applicable cases Where sushis wearing omtedasoired upenn@ shaft vmay be emp under pressure.

. sealing lwater in 5 is the impeller or other driven member 7 whose eye or suction openings 8 communicate with the space 9 normally filled with water drawn into the suction openings 8 of the impeller whemthe latter is in operawhich the sleeve 6 has a running fit fand in 'the' bearing'surface or inner wall of such extension Yis a helical groovefli, the cross section'of the groove" being shown as V shapedv though any other suitable shape ldyed. One .end of the groove lll'icominiinicates `with the short groove 16 communicating with the chamber or hollow space 1 7 within the stuffing box, suchchamber being annular and t surrounding the shaft. Communicating with the chamber 1,7

is it plurality of holes 118 tapped to receive a pipe, as 19, connecting with any suitable water or other liquid supply under pressure, such as a city water main or, where the stuling box is applied to a centrifugal pump, to the discharge connection of'lthat pump.' The plurality of holes 18 is provided so that 'the pipe connection may be made with that hole which is most con- Patenten Jan. 12,1915.

venient for the purpose and then .the other holes may be lugs 20.

lVithin the cylindrical `recess 21 in the stulling box 10 may be placed packing 22 plugged up by screw-threaded compressed by the gland 23 having the lugs 24 through which extend screw threaded fstuds v25 threaded intorthe stuffing box 10,

n uts 26 serving toforce 'the gland.' to the right, asvieived in Fig. 1, to compress lthe packing in a manner wel-l understood.

In operation, water or liquid under pressure is delivered by pipe 19 into the chamber r17, filling the same with ,Water or liquid 'y Leakage .of this liquid or j water toward the left, Fig. 1, from chamber 17 `:along the sleeve 6 is prevented bythe 'packing' 22 and gland 23.v Assuming that there isla suction pressure or pressure below .atmospheric .in fthssree 9*..there would he e 'tendency vfor vnir to'lealr loing th 'sleeve .6 I

into" the'space llhisis prvgntedby the ...high-'weer b er =through said tion as to oppose but not completely prevent passage of a film of liquid or water longitudinaliy of the sleeve 6 toward the'right in 1. Thus liquid or water passes very slowly or in slight quantity from the cham-v ber 17 into the space 9, vthis sealing .liquidor Water preventing the entry of air Which would otherwise linterfere with the mainte nance of proper pressure or operation Within the pump or chamber 9.

Obviously the samestructure mav'be used topi-event leakage in ,the case where the pressure. inside of the pump or other chamber is higher. than the pressure outside of the same, in which case'the pitch of the groove 1.4@ would preferably be reversed for the same given direction of rotation of shaft` What l claim'is: L 'The combination with a shaft, of a stu-fling box having a chambercontaining fiuid under pressure, and apart having a running fit -xi-'ith said shaft and having a helical groove communicating with. said chamber.

2. The combination with a shaft, of .a stufling box having an annular, chamber containing .fluid under pressure, and a part in which said shaft has a, running fit, said part having a helical groove communicating with said chamber and extending around said shaft in the` bearing siirfaceof said part. e. The combination vwith a. ,shaftaof a. stuling box having -anv annular fchainbe'r containing'fiuidjunder pressurefand a part in which said shaft hasa running fit, said parthaving a'groove communicating with saidlchambr-.r and extending around and longitudinallv of said shaft in the-bearing surface of said part. f

4. The combination with a' shaft, 'ofa stuffingl box` having a chambercontaining fluid under-pressure, a part in vwhich said shaft has a running fit, said' part having a helical groove in the bearing surface of said part' and communicating with said' chamber, said shaft rotatingin such direction and said .groove pitched insufch direction Ithat How of fluid from said chamL groove is opposed. v 5. -The combination with ag shaft, .lof a stuffing box having a chamber containing fluid under pressure, a Apart'on one side of said chamber in which said shaft has a running'fit, said part having `a groove commu: nicating with said chamber 'stuing box comprising la memberA having 'nicating with ,said chamber.

'and extending .around said shaft, and a fluid packing between said shaft-and said stuflinfY box on the other side of said ohamberfd'ip '6. The combination with a shaft, of` a stuffing box having a chamber containing fluidA under pressure, a part in which said shaft has a runningvt, the bearing surface between said shaft and said part having a helical groove communicating at its one end with said cha'mberfsaid shaftv rotating in such direction -and said groove pitched in such direction as to coperate with the fluid pressure to prevent ,leakage of another material' along said shaft. v

:17. The. combination with a shaft, of a stuffing box having a chamber containing fluid under pressure, a part on one side' of said cha berinwhich said shaft has -av running `t, the bearing surface between said shaft and said part havinga helical groove communicating with said chamber, a packing surrounding said shaft ongthe other sidcv of said chamber, and 'a gland for compressino' said 'packing between said` stufling box said sha'ft. V 8. A-stufling box comprising a member having a chamber containing fluid .under pressure, a lateral projection on said member having a bore adaptedv to make a running fit with a shaft. a helicalv groove in said bore communicating with "said chamber, a second projectionon said'v member having a packing receiving bore, and a gland .extending into said bore.v

v9. The combination -with a iwan, f a

a chamber, s aid'member disposed -.utside of said wall* a lateralprojectionon Asaid member'extending into 4a. boreof-said Wall,v said projectibn havingl a bore'adaptedzto make a running- `fit with a shaft extending 1u( 'througli said Wall, and a helical 4groove :in

the bearing face of said extension commu- 10."The combination with a "Yall having a bore and a counterhore, of a sleeve in said bore having a shoulder 1nl saldv counterbore, a member outside of said wall having a chamber, a lateral extensionfon.said-member disposed in saidcounterbore and adapti ed to have a running fit with a shaft ex- Il( tending through .said Wall, fand a helical groove communicating .with said chamber.

In testimony whereof I have hereunto affixed my signature in the presence of the two subscribing witnesses, April 21,1914.

THOMAS M.v PLATT.

Vitnesses z.

NELLIE FIELD, N. B. EVANS.

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